Well if you include foreplay, about 25-30 minutes. Foreplay, it just doesn’t sound right.
Placing OP spoilers in Quote tags stops that from happening.
It all depends on what the two of you need. Sometimes, you’re in the mood for two hours, three hours, maybe more, of leisurely sex. But there are times when you both just want to tear the clothes away and go at it fast and hard.
It’s the variety that makes it so cool.
I guess the assumption is that we’re talking about heterosexual sex.
In my experience, female soreness sets in at about 15-20 minutes, in most cases. Some women seem tougher and like it to last longer, but the vast majority of my partners start to get uncomfortable at about then. Not uncomfortable enough to stop, but enough that they feel sore afterwards. Multiorgasms seem to have little effect on this. Exceeding 20 minutes often starts to feel like “work” to one partner.
People talk about screwing for 30-60 minutes or more, but I suspect such things as enjoyable events are very rare, or are exaggerated. Times when I’ve gone on that long have not been the best, I’d say, for one or both of us. (Although the “so horny I haven’t seen you in too long let’s fuck all weekend” scenario has been great from time to time.)
Foreplay and post-coital snuggling can last as long as possible, needless to say.
It seems to me that best, “glowiest,” most mind-blowing sex I’ve had for both my partner and myself, penetration to my orgasm, was about 10-15 minutes, this after say 30 minutes of foreplay and generally feeling horny that day, and barring anything unusual like not having seen my lover for a long time.
Well figuring out out a woman’s vagina is like trying to solve a frick’n Rubik’s cube. Sometimes I’m on my “A” game and sometimes I’m not.
Sooner or later the puzzle will be solved tho’. It all depends on the woman I guess.
I was thinking ‘45 minutes’, but if you include foreplay, it could go up to a week. (My definition of foreplay is very wide, and can include things like massage, backscratching, bringing a meal in bed, washing the dishes and doing the laundry. 
)
Yes, chafing, ow. I really hope people talking about doing it for hours aren’t just banging away (with help from numbing cream), but are including ‘mid-play.’ Really, with foreplay, afterplay and mid-play (basically foreplay and afterplay but in between penetration), it’s a wonder we equate ‘sex’ with ‘dick-in-vagina’ at all.
what **catfight ** said. the actual bumping uglies is good for maybe 15 minutes max. as an experiment once we tried some of the ‘sex sauces’ to keep uh, things moving along just to see what our tolerances were. ugh. bad idea. never again. while it was very nice at the time, there were side effects we hadn’t counted on. and before you ask, no. i’m not mentioning the side effects on this thread. 
total time spent in foreplay, mid play, etc. about two hours as a rule.
Depends on whether its halftime or just a commercial break.
Depends how long the batteries last.
Finding it or doing it?
Yogi Berra used to say it wasn’t the sex that wore the players out for the game the next day, it was staying up til 5 in the morning looking for it.
Televised sports is why doggy style was invented. You don’t have to miss a minute of the game!
Bah, a question like this demands one of two things. Either empirical data, or detailed personal description. This thread is lacking the latter, so I will generously provide some. Possible TMI ahead.
Having sex while on SSRIs makes for unpredictable timing. I suppose it could just be me and a relative lack of sexual experience (3 women, my hands, and a utensil), but it’s more fun to blame the meds. Anyway, sometimes it’s 1-2 minutes, sometimes it’s 5 minutes, sometimes its 15 minutes, and sometimes it’s never, the it being my male orgasm. As for my experience, I’d say 3-10 minutes of coitus is typically ideal. I say typically because mindblowing sex is not like a microwave. You don’t press a button and watch things heat up. Not most people anyway!
There’s so many different levels of coitus too. Hard fucking, I can’t take much more than 3 minutes. For soft fucking, sexual anxiety starts to creep in and I find I can’t finish. Worse yet, the melty man may make an appearance 
It’s possible to vary intensities, but I at least find it difficult to go from piston-pumping crotch-grinding monkey sex back to soft vaginal massaging. ::cough:: Positions make an impact also. If she’s on top, I’m like the energizer bunny. Switch and it’s usually fast or never (my arms sometimes get tired and it kills the libido). That’s about it from my end.
As for my SO, I happen to like foreplay, and she happens to like me doing it. Generous foreplay and any coitus over around two minutes makes her a happy camper. The difference between good sex and great sex with us seems to be the passion and the amount of foreplay, not the duration of coitus.
In summary, 2<X<15 is ideal. I can’t answer the OP’s question because I already read the other thread.
I’d say 10-15 minutes, though maybe 20. Any time I’d had sex for only a few minutes I was really dissapointed and annoyed with the waste of effort.
Too long and it was usually just going 'cuz we could.
Sometimes it went a good 45 minutes or so really well, but that was the exception.
My girlfriend told me I was a lousy lover.
I ask you, “How can someone make a judgment like that in just two minutes?”
girl: "How long does good sex take? "
guy: “How long you got…?”
My entire life.
Depends on the guy. If he doesn’t know what he is doing or “lacking” where I know I won’t get anything out of it… then ya… sure I can spare 3 minutes.
Though if he is “decent” and isn’t “all about him” which seemly most the guys I have met are… Then at least 10 minutes. I wanna have my fun too. LOL
I try to limit it to 2 hours at my age.
At MY age, I’d rather not say how long good sex takes. Sigh